Helicopter with diesel engine (ecomotors)

[chatelot16]

2 small crankshafts will have the same weight as a large one

if a gear unit with only one output gear and 2 input gear is required on the 2 crankshafts, this gear unit will even be slightly lighter than a simple gear unit

of course if there is no need for a reduction the transmission between the 2 crankshafts which is a loss: but lighter than the big connecting rods!

for a helicopter there is necessarily a need for reduction

I see a small helicopter with a gasoline engine like lycoming with a flat cylinder with a transmission by trapezoidal belt to make a first reduction between the engine and the gear reducer ... bad example not to follow

[Aumicron]

2 crankshaft means 2 crankshaft passing each half of the rain so 2 times lighter: total weight not heavier ...

I am not sure that a vilo which passes 2 times less power is 2 times less heavy but in this case necessarily 4 bearings therefore frottemments more important and 2 parts which turn instead of one and synchro system in more. .

In the case of the OPOC engine, I don't see how you would train the middle pistons with only 2 exterior vilos without going through large connecting rods.

[chatelot16]

2 crankshaft on each side and the piston between the 2 is enough

no need to align 2 pairs of piston as in this opoc engine

these 2 pairs of piston stupidly increase the width of the machine

[Flytox]

Example of a Detroit 2-stroke diesel truck: we don't usually hear that in France! http://www.youtube.com/watch?v=EnN1i9Lj ... re=related

The noise is nice, it looks like a large US container. By cons the number of speed is impressive (15?). Another oddity, it makes a lot of noise but it does not advance

For the Ecomotor it is true that it is "rod"

[chatelot16]

detroit diesel I've seen and heard in the "Michigan" or Richier wheel loaders or timberjack forestry tractors

it is quite slow engine but as it is 2 stroke it makes a noise 2 times faster ...

intake by light, exhaust by valve (often 4 valve per cylinder): I find it a shame we keep the main disadvantage of the 4 stroke: the weak point of the exhaust valves

[oiseautempete]

The noise is nice, it looks like a large US container. By cons the number of speed is impressive (15?). Another oddity, it makes a lot of noise but it does not advance

it included short reports, I think just for the demo, because we only use them when loaded or on steep slopes ... (just like on 4x4s and HGVs from us)
It is certainly not violent but 62 mph = 100km / h which is correct for an old truck ... In the USA 2-stroke diesel are common (up to 900hp on recent road and agricultural tractors!) While in Europe is rare (old equipment only) because too noisy and polluting ...

[chatelot16]

I am not sure that a vilo which passes 2 times less power is 2 times less heavy but in this case necessarily 4 bearings therefore frottemments more important and 2 parts which turn instead of one and synchro system in more. .

I'm sure

and even more: the central crankshaft of the opoc engine has too much connecting rod, it forces to make bearings not wide enough therefore of larger diameter to have the right surface: it increases friction

smaller crankshafts with less connecting rods will have smaller diameter bearings, therefore less friction

[oiseautempete]

[quote = "chatelot16] I'm sure

and even more: the central crankshaft of the opoc engine has too much connecting rod, it forces to make bearings not wide enough therefore of larger diameter to have the right surface: it increases friction

smaller crankshafts with less connecting rods will have smaller diameter bearings, therefore less friction [/ quote]

well you're twisted: you forget the safety coefficients which impose to build the parts much more solid than theoretically necessary, suddenly 2 crankshafts will necessarily be much heavier than one (with a ladle at least + 30%), with good more friction, more the engine block will also have to be much more solid because at the level of the crankshafts the torsional forces are enormous.
No need to go far: the Junkers diesel engines were very heavy for aircraft engines, much heavier than the Clergets, moreover the crankshaft of a star engine is very short (same as single cylinder) which allows, despite the large counterweight, to be lighter than an online engine crankshaft, that's why besides that despite a theoretical advantage level performance of the Junkers with opposed pistons, in reality its specific consumption does not was no better than that of the Clerget due to mechanical losses and a higher mass (additional weight = reduced carrying capacity for the aircraft, or / and increased consumption) ...

[chatelot16]

for the comparison between one and two vilbrequi online I do not worry

but obviously the star engine has a huge superiority on the inline engine for the weight of the crankshaft

but I do not think that the superiority of the clergy over the junker is due to the star shape or even to the choice of 4-stroke instead of 2-stroke: I think of a superiority on the spraying of diesel which allows it to turn faster

I don't know how the injectors of the airplane junker were made, but on the clm junker license that I have at home it's injectors without needles: it works rather on the principle of the aerosol spray nozzle: arrived tangential for swirl out through the central hole

my junker engine miserably fouls the exhaust lights and it smokes a lot, I mounted one in a generator: the first time I tried it at full power, it rained red glowing particles for 1/4 time to burn all the carbon accumulated in the exhaust

these engines must not run at more than 1000 rpm otherwise combustion has no time to take place in the cylinder: with better injection, the mechanics of these engines would be able to run much faster

the clamming of clm engines is not only at home: an old mechanic specializing in clm compressors, told me that it was necessary to regularly open the access hatches provided for and scraping with a brass tool so as not to risk damage the edge of the lights

[lechancel]

http://ppdgemini.com/

they will present a 70 hp in 2011 not certified for the European ULM market at the end of 2011, it is being tested, source Dereck Graham director Gemini